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<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>7_2伪元素</title>
    <style>
        .a1::before {
            content: "✳";
        }

        .a2::after {
            content: "✳";
        }
    </style>
</head>

<body>
    <a class="a1">第一个超级链接</a>
    <a class="a1">第二个超级链接</a>
    <a class="a1">第三个超级链接</a>
    <p></p>
    <a class="a2">第四个超级链接</a>
    <a class="a2">第五个超级链接</a>
    <a class="a2">第六个超级链接</a>
</body>

</html>